## v1.9.1 (2019-07-18)
### 1. Enhancements
#### Mix
* [mix format] Print relative paths in `--check-formatted` output
* [mix release] Support included applications
### 2. Bug fixes
#### Elixir
* [Code] Fix formatter wrongly removing nested parens in nested calls
#### Logger
* [Logger] Do not crash translator on poorly formatted supervisor names
#### Mix
* [mix compile] Raise readable error for mismatched sources during compilation
* [mix release] Preserve UTF8 encoding in release config files
## v1.9.0 (2019-06-24)
### 1. Enhancements
#### EEx
* [EEx] Allow more complex mixed expressions when tokenizing
#### Elixir
* [Access] Allow `Access.at/1` to handle negative index
* [CLI] Add support for `--boot`, `--boot-var`, `--erl-config`, `--pipe-to`, `--rpc-eval`, and `--vm-args` options
* [Code] Add `static_atom_encoder` option to `Code.string_to_quoted/2`
* [Code] Support `:force_do_end_blocks` on `Code.format_string!/2` and `Code.format_file!/2`
* [Code] Do not raise on deadlocks on `Code.ensure_compiled/1`
* [Config] Add `Config`, `Config.Reader`, and `Config.Provider` modules for working with configuration
* [File] Add `File.rename!/2`
* [Inspect] Add `:inspect_fun` and `:custom_options` to `Inspect.Opts`
* [Kernel] Add `~U` sigil for UTC date times
* [Kernel] Optimize `&super/arity` and `&super(&1)`
* [Kernel] Optimize generated code for `with` with a catch-all clause
* [Kernel] Validate `__struct__` key in map returned by `__struct__/0,1`
* [Module] Add `Module.get_attribute/3`
* [Protocol] Improve `Protocol.UndefinedError` messages to also include the type that was attempted to dispatch on
* [Protocol] Optimize performance of dynamic dispatching for non-consolidated protocols
* [Record] Include field names in generated type for records
* [Regex] Automatically recompile regexes
* [Registry] Add `Registry.select/2`
* [System] Add `System.restart/0`, `System.pid/0` and `System.no_halt/1`
* [System] Add `System.get_env/2`, `System.fetch_env/1`, and `System.fetch_env!/1`
* [System] Support `SOURCE_DATE_EPOCH` for reproducible builds
#### ExUnit
* [ExUnit] Allow multiple `:exclude` on configuration/CLI
* [ExUnit.DocTest] No longer wrap doctest errors in custom exceptions. They ended-up hiding more information than showing
* [ExUnit.DocTest] Display the actual doctest code when doctest fails
#### IEx
* [IEx.CLI] Copy ticktime from remote node on IEx `--remsh`
* [IEx.CLI] Automatically add a host on node given to `--remsh`
#### Logger
* [Logger] Use a decentralized mode computation for Logger which allows overloads to be detected more quickly
* [Logger] Use `persistent_term` to store configuration whenever available for performance
#### Mix
* [Mix] Follow XDG base dir specification in Mix for temporary and configuration files
* [Mix.Generator] Add `copy_file/3`, `copy_template/4`, and `overwite?/2`
* [Mix.Project] Add `preferred_cli_target` that works like `preferred_cli_env`
* [mix archive.uninstall] Allow `mix archive.uninstall APP` to uninstall any installed version of APP
* [mix new] No longer generate a `config/` directory for mix new
* [mix release] Add support for releases
* [mix release.init] Add templates for release configuration
* [mix test] Allow running tests for a given umbrella app from the umbrella root with `mix test apps/APP/test`. Test failures also include the `apps/APP` prefix in the test location
### 2. Bug fixes
#### EEx
* [EEx] Consistently trim newlines when you have a single EEx expression per line on multiple lines
#### Elixir
* [Code] Quote `::` in `Code.format_string!/1` to avoid ambiguity
* [Code] Do not crash formatter on false positive sigils
* [Enum] Ensure the first equal entry is returned by `Enum.min/2` and `Enum.max/2`
* [Kernel] Improve error message when string interpolation is used in a guard
* [Kernel] Properly merge and handle docs for callbacks with multiple clauses
* [Kernel] Guarantee reproducible builds on modules with dozens of specs
* [Kernel] Resolve `__MODULE__` accordingly in nested `defmodule` to avoid double nesting
* [Kernel] Type variables starting with an underscore (`_foo`) should not raise compile error
* [Kernel] Keep order of elements when macro `in/2` is expanded with a literal list on the right-hand side
* [Kernel] Print proper location on undefined function error from dynamically generated functions
* [Kernel] **Potentially breaking** Do not leak aliases when nesting module definitions that are fully namespaced modules. If you defined `defmodule Elixir.Foo.Bar` inside `defmodule Foo`, previous Elixir versions would automatically define an alias, but fully namespaced modules such as `Elixir.Foo.Bar` should never define or require an alias. If you were accidentally relying on this broken behaviour, your code may no longer work
* [System] Make sure `:init.get_status/0` is set to `{:started, :started}` once the system starts
* [Path] Do not expand `~` in `Path.expand/2` when not followed by a path separator
* [Protocol] Ensure `debug_info` is kept in protocols
* [Regex] Ensure inspect returns valid `~r//` expressions when they are manually compiled with backslashes
* [Registry] Fix ETS leak in `Registry.register/2` for already registered calls in unique registries while the process is still alive
#### ExUnit
* [ExUnit] Raise error if attempting to run single line tests on multiple files
* [ExUnit] Return proper error on duplicate child IDs on `start_supervised`
#### IEx
* [IEx] Automatically shut down IEx if we receive EOF
#### Logger
* [Logger] Don't discard Logger messages from other nodes as to leave a trail on both systems
#### Mix
* [mix compile] Ensure Erlang-based Mix compilers (erlang, leex, yecc) set valid position on diagnostics
* [mix compile] Ensure compilation halts in an umbrella project if one of the siblings fail to compile
* [mix deps] Raise an error if the umbrella app's dir name and `mix.exs` app name don't match
* [mix deps.compile] Fix subcommand splitting bug in rebar3
* [mix test] Do not consider modules that are no longer cover compiled when computing coverage report, which could lead to flawed reports
### 3. Soft-deprecations (no warnings emitted)
#### Mix
* [Mix.Config] `Mix.Config` has been deprecated in favor of the `Config` module that now ships as part of Elixir itself. Reading configuration files should now be done by the `Config.Reader` module
### 4. Hard-deprecations
#### Elixir
* [CLI] Deprecate `--detached` option, use `--erl "-detached"` instead
* [Map] Deprecate Enumerable keys in `Map.drop/2`, `Map.split/2`, and `Map.take/2`
* [String] The `:insert_replaced` option in `String.replace/4` has been deprecated. Instead you may pass a function as a replacement or use `:binary.replace/4` if you need to support earlier Elixir versions
#### Mix
* [Mix.Project] Deprecate `Mix.Project.load_paths/1` in favor of `Mix.Project.compile_path/1`
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